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Original Message (ID '127477') By Chenyu Lue:
Since you use NDSolve to solve your differential equation, all variables, except x and y, must have the definite values. So please check your input clearly. By the way, since a and b are related to x and y and you want to get the x[t] and y[t], why not define a and b as 4.721 - y[t] and 9.20566 + 1.85*t - x[t] respectively? Hope this will help you!